function postSourcing(scriptContext) {

      try {
        var currentRecord = scriptContext.currentRecord;
        var fieldchanged = scriptContext.fieldId;

        if (fieldchanged == "customer") {
          var cusid = currentRecord.getValue({fieldId: 'customer'});
          if (cusid != null && cusid != "") {
            var url = url.resolveScript({
              scriptId: 'customscript_load_invoice_groups',
              deploymentId: 'customdeploy_load_invoice_groups',
              returnExternalUrl: false,
              params: {
                  cusid: cusid
                }
            });
            addSublistValues(currentRecord, cusid);
          } else {
            var lines = currentRecord.getLineCount({sublistId: 'recmachcustrecordpayment_parent'});
            for (var i = lines - 1; i >= 0; i--) {
              log.debug('looping on line: ', i);
              currentRecord.removeLine({sublistId: 'recmachcustrecordpayment_parent', line: i, ignoreRecalc: true});
          }
          }
        }

      } catch (e) {
        log.debug('Error reads: ', e.name + e.message);
      }
  }

I am trying to pass a parameter to a suitelet from a client script - I am getting this error: TypeErrorCannot read properties of undefined (reading 'resolveScript')

I think the problem is with

url

- can you share your define statement?

url is just supposed to use the N/url module

but you are resetting url in this line!

var url = url.resolveScript(

gotcha

avoid accidental reassignment by using

const

what if I just remove the first part and just do url.resolveScript

be be sure you did something like

import * as url from 'N/url'

im just trying to pass a parameter to a suitelet

other than that, according to the docs,

resolveScript

is only available for server-side scripts.

hmm

yeah I mean maybe i'm not using the right thing but I want to pass a value to a suitelet

I think the issue with the code is that the param keys need to be quoted

params: {
    'cusid': cusid
}

they should only need to be quoted if they are not valid JS identifiers without the quotes, unless I'm missing something fundamental?